<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <!-- 这里引用的是public里的文件。项目执行后：public文件会自动放入src下，所以直接使用/索引即可 -->
  <link rel="icon" href="/favicon.ico" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>编程智航</title>
  <!-- 初次加载动画效果 -->
  <style>
    #loading-mask {
      position: fixed;
      left: 0;
      top: 0;
      height: 100%;
      width: 100%;
      background: #fff;
      user-select: none;
      z-index: 9999;
      overflow: hidden;
    }

    .loading-wrapper {
      position: absolute;
      top: 50%;
      left: 50%;
      text-align: center;
      transform: translate(-50%, -100%);
    }

    .loading-tips {
      margin-top: 10px;
      color: grey;
      font-size: 14px;
    }

    .loading-dot {
      animation: antRotate 1.2s infinite linear;
      transform: rotate(45deg);
      position: relative;
      display: inline-block;
      font-size: 40px;
      width: 40px;
      height: 40px;
      box-sizing: border-box;
    }

    .loading-dot i {
      width: 20px;
      height: 20px;
      position: absolute;
      display: block;
      background-color: #1890ff;
      border-radius: 100%;
      transform: scale(0.75);
      transform-origin: 50% 50%;
      opacity: 0.3;
      animation: antSpinMove 1s infinite linear alternate;
    }

    .loading-dot i:nth-child(1) {
      top: 0;
      left: 0;
    }

    .loading-dot i:nth-child(2) {
      top: 0;
      right: 0;
      -webkit-animation-delay: 0.4s;
      animation-delay: 0.4s;
    }

    .loading-dot i:nth-child(3) {
      right: 0;
      bottom: 0;
      -webkit-animation-delay: 0.8s;
      animation-delay: 0.8s;
    }

    .loading-dot i:nth-child(4) {
      bottom: 0;
      left: 0;
      -webkit-animation-delay: 1.2s;
      animation-delay: 1.2s;
    }

    @keyframes antRotate {
      to {
        -webkit-transform: rotate(405deg);
        transform: rotate(405deg);
      }
    }

    @-webkit-keyframes antRotate {
      to {
        -webkit-transform: rotate(405deg);
        transform: rotate(405deg);
      }
    }

    @keyframes antSpinMove {
      to {
        opacity: 1;
      }
    }

    @-webkit-keyframes antSpinMove {
      to {
        opacity: 1;
      }
    }
  </style>
</head>

<body>
  <div id="app">
    <div id="loading-mask">
      <div class="loading-wrapper">
        <span class="loading-dot loading-dot-spin"><i></i><i></i><i></i><i></i></span>
        <div class="loading-tips">初次加载较慢，请耐心等待...</div>
      </div>
    </div>
  </div>
  <script type="module" src="/src/main.js"></script>
</body>

</html>